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arXiv 0801.2762hep-thhep-lathep-ph
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Landau规范Yang-Mills理论中的红外奇异性

Infrared singularities in Landau gauge Yang-Mills theory

Reinhard Alkofer, Markus Q. Huber, Kai Schwenzer

摘要:

我们提出了一个更详细的图片的朗道规范杨米尔斯理论的红外区。这是在一个新的框架内,允许考虑到有限尺度内的红外功率计数分析的影响。我们发现Dyson-Schwinger方程组存在两个性质不同的红外不动点。第一个扩展了已知的标度解,其中鬼动力学占主导地位,胶子传播被强烈抑制。它的特点除了强的胶子顶点函数的分歧在以前考虑的统一标度极限,当所有的外部动量趋于零,也较弱的运动学分歧,当只有一些外部动量消失。第二种解决方案代表了最近提出的退耦方案,其中胶子变得有质量,鬼仍然裸露。在这种情况下,我们发现,没有一个顶点功能的增强,使红外动力学是完全抑制。我们的分析还提供了一个严格的论据,为什么朗道规范胶子敷料函数不能红外发散。

英文摘要:

We present a more detailed picture of the infrared regime of Landau gauge Yang-Mills theory. This is done within a novel framework that allows one to take into account the influence of finite scales within an infrared power counting analysis. We find that there are two qualitatively different infrared fixed points of the full system of Dyson-Schwinger equations. The first extends the known scaling solution, where the ghost dynamics is dominant and gluon propagation is strongly suppressed. It features in addition to the strong divergences of gluonic vertex functions in the previously considered uniform scaling limit, when all external momenta tend to zero, also weaker kinematic divergences, when only some of the external momenta vanish. The second solution represents the recently proposed decoupling scenario where the gluons become massive and the ghosts remain bare. In this case we find that none of the vertex functions is enhanced, so that the infrared dynamics is entirely suppressed. Our analysis also provides a strict argument why the Landau gauge gluon dressing function cannot be infrared divergent.

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